What size homes qualify for flat-rate pricing?

Homes up to 3,500 square feet of conditioned area qualify for our flat-rate residential MEP pricing. Anything larger than 3,500 SF receives a custom quote, so the scope and fee match the added complexity of the project.

Flat-Rate Size Tiers

Pricing steps up by size tier and by how many disciplines you order, so you can see your cost before committing.

How Size Is Measured

A few factors determine which tier applies and whether small add-ons come into play.

• Pricing is based on conditioned (heated and cooled) square footage.
• Additions and remodels are typically scoped by the affected area and the systems involved.
• Bedroom and bathroom counts can add modest fees (+$100 per bedroom, +$150 per bathroom).
• Add-ons such as gas piping or an EV charger circuit are priced separately from the size tier.

Over 3,500 SF

Larger custom homes involve more equipment, more circuits, and additional coordination, so we provide a tailored quote rather than a flat rate. Email orders@mepplansusa.com with your architectural plans and we'll return a scope and price. Note that ADUs follow a separate pricing structure up to 1,200 SF, detailed on our cost of ADU MEP plans page.

Exact square-footage classification can depend on how area is calculated for your permit — requirements vary by jurisdiction, so verify with your local building department if you're near a tier boundary. The flat-rate model exists so you aren't billed by the hour for a residential project of predictable scope, which makes it easier to plan your overall construction budget. If your home sits right at the edge of a tier, share your plans and we'll confirm which bracket applies before you commit. To see all tiers side by side, visit our pricing page, then place your order to confirm your flat rate and we'll coordinate the set with your architectural drawings.